SN75ALS1177, SN75ALS1178

DUAL DIFFERENTIAL DRIVERS AND RECEIVERS

SLLS154A – MARCH 1993 – REVISED MAY 1995

6

POST OFFICE BOX 655303

DRIVER SECTION

electrical characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VIK

Input clamp voltage

II = – 18 mA

– 1.5

V

VOH

High-level output voltage

VIH = 2 V,

VIL = 0.8 V,

IOH = – 33 mA

3.3

V

VOL

Low-level output voltage

VIH = 2 V,

VIL = 0.8 V,

IOL = 33 mA

1.1

V

|VOD1|

Differential output voltage

IO = 0

1.5

6

V

VCC = 5 V,

1/2 VOD1

|VOD2|

Differential output voltage

CC

,

RL = 100 Ω

See Figure 1

2

V

RL = 54 Ω

1.5

5

|VOD3|

Differential output voltage

See Note 3

1.5

5

V

∆|VOD|

Change in magnitude of differential

output voltage (see Note 4)

±0.2

V

VOC

Common-mode output voltage

RL = 54 Ω or 100 Ω,

See Figure 1

–1 ‡

3

V

∆|VOC|

Change in magnitude of common-mode

output voltage (see Note 4)

±0.2

V

IO(OFF)

Output current with power off

VCC = 0,

VO = – 7 V to 12 V

±100

µA

IOZ

High-impedance-state output current

VO = – 7 V to 12 V

±100

µA

IIH

High-level input current

VIH = 2.7 V

100

µA

IIL

Low-level input current

VIL = 0.4 V

– 100

µA

VO = – 7 V

– 250

IOS

Short circuit output current

VO = VCC

250

mA

IOS

Short-circuit output current

VO = 12 V

250

mA

VO = 0 V

150

ICC

Supply current (total package)

No load

Outputs enabled

35

50

mA

ICC

Supply current (total package)

No load

Outputs disabled

20

50

mA

† All typical values are at VCC = 5 V and TA = 25°C.

‡ The algebraic convention, where the less positive (more negative) limit is designated as minimum, is used in this data sheet for common-mode

output and threshold voltage levels only.

NOTES:

3. See EIA Standard RS-485 Figure 3.5, test termination measurement 2.

4.

∆|VOD| and ∆|VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high

level to a low level.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

tPLH

Propagation delay time, high- to low-level output

R60

Ω

C

C

100 F

9

15

22

ns

tPHL

Propagation delay time, low- to high-level output

RL = 60 Ω,

See Figure 3

CL1 = CL2 = 100 pF,

9

15

22

ns

tsk

Output-to-output skew

See Figure 3

0

2

8

ns

tPZH

Output enable time to high level

CL = 100 pF,

See Figure 4

30

35

50

ns

tPZL

Output enable time to low level

CL = 100 pF,

See Figure 5

5

15

25

ns

tPHZ

Output disable time from high level

CL = 15 pF,

See Figure 4

7

15

30

ns

tPLZ

Output disable time from low level

CL = 15 pF,

See Figure 5

7

15

30

ns